A yellow ball with a blue stripe and red star, known as the Luxo Ball (a.k.a. Pixar Ball), first appeared in the Luxo, Jr. short as a prop for Luxo, Jr. Since its debut, it has made numerous cameos in other Pixar films, most prominently in the Toy Story films.
In Red's Dream, the design and color scheme of the ball appears on the floor of the circus ring.
In Toy Story, a ball rolls down the hallway of Andy's house as Sarge helps a "wounded" soldier to an indoor plant. A little later, one of Andy's friends bounce that ball up the stairs to Andy's room. Later, when Buzz proves to the toys that he can "fly," he bounces off that ball when he jumps off from Andy's bed.
In Toy Story 2, one ball appears in a TV commercial for Al's Toy Barn. Later, after the toys enter the toy store, one ball can be seen on the floor to the left, and a whole container of those balls can be seen to the left of the door when exiting.
The scene where Luxo, Sr. rolled the ball to Luxo. Jr in Luxo Jr. was also among the scenes that were flipped through by Hamm to find a commercial for Al's Toy Barn (which came after this scene).
On all the Pixar Family Build areas and packs in LEGO The Incredibles. A giant LEGO brick version of it is part of Luxo Jr.'s (called Junior) Pixar Family Build (which is unlocked after completing the other Pixar Family Builds; completing this one will unlock Junior himself) and the ball can be summoned by Junior as an attack item and during his idle animation.
As a power-up that can be formed by matching 5 pieces in an L or T-shape and used to remove all surrounding pieces in Toy Story Drop!, also in the background and part of the logo as the "o" in the word "Drop".
The ball looks exactly the same as the one in the Nick Jr. show Blue's Clues, except the colors of the star and stripe are swapped.
The ball also looks exactly the same as the one in the Nickelodeon show Rugrats, except the ball is green with an orange star and blue stripe. The stripe is sometimes purple.
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